adds WARP support to Chromium, for Metro mode only, on Windows 8

content/browser/gpu/gpu_data_manager_impl_private.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_PRIVATE_H_
 #define CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_PRIVATE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 24 matching lines @@
   bool IsDriverBugWorkaroundActive(int feature) const;
   gpu::GPUInfo GetGPUInfo() const;
   void GetGpuProcessHandles(
       const GpuDataManager::GetGpuProcessHandlesCallback& callback) const;
   bool GpuAccessAllowed(std::string* reason) const;
   void RequestCompleteGpuInfoIfNeeded();
   bool IsCompleteGpuInfoAvailable() const;
   void RequestVideoMemoryUsageStatsUpdate() const;
   bool ShouldUseSwiftShader() const;
   void RegisterSwiftShaderPath(const base::FilePath& path);
+  bool ShouldUseWarp() const;
   void AddObserver(GpuDataManagerObserver* observer);
   void RemoveObserver(GpuDataManagerObserver* observer);
   void UnblockDomainFrom3DAPIs(const GURL& url);
   void DisableGpuWatchdog();
   void SetGLStrings(const std::string& gl_vendor,
                     const std::string& gl_renderer,
                     const std::string& gl_version);
   void GetGLStrings(std::string* gl_vendor,
                     std::string* gl_renderer,
                     std::string* gl_version);
@@ skipping 139 matching lines @@
   // Update the GPU switching status.
   // This should only be called once at initialization time.
   void UpdateGpuSwitchingManager(const gpu::GPUInfo& gpu_info);
 
   // Notify all observers whenever there is a GPU info update.
   void NotifyGpuInfoUpdate();
 
   // Try to switch to SwiftShader rendering, if possible and necessary.
   void EnableSwiftShaderIfNecessary();
 
+  // Try to switch to WARP rendering if the GPU hardware is not supported or
+  // absent, and if we are trying to run in Windows Metro mode.
+  void EnableWarpIfNecessary();
+
   // Helper to extract the domain from a given URL.
   std::string GetDomainFromURL(const GURL& url) const;
 
   // Implementation functions for blocking of 3D graphics APIs, used
   // for unit testing.
   void BlockDomainFrom3DAPIsAtTime(const GURL& url,
                                    GpuDataManagerImpl::DomainGuilt guilt,
                                    base::Time at_time);
   GpuDataManagerImpl::DomainBlockStatus Are3DAPIsBlockedAtTime(
       const GURL& url, base::Time at_time) const;
@@ skipping 10 matching lines @@
 
   scoped_ptr<gpu::GpuBlacklist> gpu_blacklist_;
   scoped_ptr<gpu::GpuDriverBugList> gpu_driver_bug_list_;
 
   const scoped_refptr<GpuDataManagerObserverList> observer_list_;
 
   std::vector<LogMessage> log_messages_;
 
   bool use_swiftshader_;
 
+  bool use_warp_;
+
   base::FilePath swiftshader_path_;
 
   // Current card force-blacklisted due to GPU crashes, or disabled through
   // the --disable-gpu commandline switch.
   bool card_blacklisted_;
 
   // We disable histogram stuff in testing, especially in unit tests because
   // they cause random failures.
   bool update_histograms_;
 
@@ skipping 13 matching lines @@
   // True if all future Initialize calls should be ignored.
   bool finalized_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuDataManagerImplPrivate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_PRIVATE_H_